SIST-TP CEN ISO/TR 16060:2014

SLOVENSKI STANDARD
01-november-2014
1DGRPHãþD
SIST CR 12361:1999
SIST CR 12361:1999/AC:1999
Porušitvene preiskave zvarov na kovinskih materialih - Jedkala za makroskopsko
in mikroskopsko preiskavo (ISO/TR 16060:2003)
Destructive tests on welds in metallic materials - Etchants for macroscopic and
microscopic examination (ISO/TR 16060:2003)
Zerstörende Prüfung von Schweißverbindungen an metallischen Werkstoffen - Ätzungen
für die makroskopische und mikroskopische Untersuchung (ISO/TR 16060:2003)
Essais destructifs des soudures sur matériaux métalliques - Réactifs pour examens
macroscopique et microscopique (ISO/TR 16060:2003)
Ta slovenski standard je istoveten z: CEN ISO/TR 16060:2014
ICS:
25.160.40 Varjeni spoji in vari Welded joints
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN ISO/TR 16060
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
August 2014
ICS 25.160.40 Supersedes CR 12361:1996
English Version
Destructive tests on welds in metallic materials - Etchants for
macroscopic and microscopic examination (ISO/TR 16060:2003)
Essais destructifs des soudures sur matériaux métalliques - Zerstörende Prüfung von Schweißverbindungen an
Réactifs pour examens macroscopique et microscopique metallischen Werkstoffen - Ätzungen für die
(ISO/TR 16060:2003) makroskopische und mikroskopische Untersuchung
(ISO/TR 16060:2003)
This Technical Report was approved by CEN on 18 August 2014. It has been drawn up by the Technical Committee CEN/TC 121.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TR 16060:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
The text of ISO/TR 16060:2003 has been prepared by Technical Committee ISO/TC 44 “Welding and allied
processes” of the International Organization for Standardization (ISO) and has been taken over as CEN
ISO/TR 16060:2014 by Technical Committee CEN/TC 121 “Welding and allied processes” the secretariat of
which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes CR 12361:1996.
Endorsement notice
The text of ISO/TR 16060:2003 has been approved by CEN as CEN ISO/TR 16060:2014 without any
modification.
TECHNICAL ISO/TR
REPORT 16060
First edition
2003-10-15
Destructive tests on welds in metallic
materials — Etchants for macroscopic
and microscopic examination
Essais destructifs des soudures sur matériaux métalliques — Réactifs
pour examens macroscopique et microscopique

Reference number
ISO/TR 16060:2003(E)
©
ISO 2003
ISO/TR 16060:2003(E)
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©  ISO 2003
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ii © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references . 1
3 General. 1
4 Etchants for carbon steels and low-alloy steels. 1
5 Etchants for stainless steels . 1
6 Etchants for nickel and nickel alloys . 2
7 Etchants for titanium and titanium alloys . 2
8 Etchants for copper and copper alloys . 2
9 Etchants for aluminium and aluminium alloys . 2
10 Designation. 2
Annex A (informative) Etchants for carbon steels and low-alloy steels. 3
Annex B (informative) Etchants for stainless steels. 10
Annex C (informative) Etchants for nickel and nickel alloys . 16
Annex D (informative) Etchants for titanium and titanium alloys. 18
Annex E (informative) Etchants for copper and copper alloys. 20
Annex F (informative) Etchants for aluminium and aluminium alloys. 22
Annex G (informative) List of etchants. 27

ISO/TR 16060:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In exceptional circumstances, when a technical committee has collected data of a different kind from that
which is normally published as an International Standard (“state of the art”, for example), it may decide by a
simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely
informative in nature and does not have to be reviewed until the data it provides are considered to be no
longer valid or useful.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TR 16060 was prepared by Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 5, Testing and inspection of welds.

iv © ISO 2003 — All rights reserved

TECHNICAL REPORT ISO/TR 16060:2003(E)

Destructive tests on welds in metallic materials — Etchants for
macroscopic and microscopic examination
1 Scope
This Technical Report gives a non-exhaustive list of etchants that can be used for the macroscopic and
microscopic examination of welds in accordance with ISO 17639 for the following groups of materials:
 carbon steels and low-alloy steels;
 stainless steels;
 nickel and nickel alloys;
 titanium and titanium alloys;
 copper and copper alloys;
 aluminium and aluminium alloys.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 17639, Destructive tests on welds in metallic materials — Macroscopic and microscopic examination of
welds
3 General
Where details of concentration or waters of crystallization of reagents are not defined in the annexes, Table 1
is applicable. These values should be confirmed by the suppliers of each etchant.
4 Etchants for carbon steels and low-alloy steels
The etchants for carbon and low alloyed steels are given in Annex A.
5 Etchants for stainless steels
The etchants for stainless steels are given in Annex B.
ISO/TR 16060:2003(E)
6 Etchants for nickel and nickel alloys
The etchants for nickel and nickel alloys are given in Annex C.
7 Etchants for titanium and titanium alloys
The etchants for titanium and titanium alloys are given in Annex D.
8 Etchants for copper and copper alloys
The etchants for copper and copper alloys are given in Annex E.
9 Etchants for aluminium and aluminium alloys
The etchants for aluminium and aluminium alloys are given in Annex F.
10 Designation
Etchants should be designated either by names or by numbers of tables in accordance with Annex G.
Table 1 — Characteristics of components
Components Characteristics
Specific gravity Concentration Hydrate Remarks

g/cm %
HCl 1,18 35 to 38 —
1,16 31,5 to 33
HF 1,13 40 —
HNO 1,42 69 —
H SO 1,84 98 —
2 4
a
H O — 6 % W/V — Usually 20 volumes
2 2
(i.e. 20 volume available O )
H PO 1,70 85 —
3 4
CHCOOH 1,05 99,1 — glacial
HBF 1,23 35 —
C H O — — 2
2 2 4
FeCl — — 6
CuCl — — 2
MgCl — — 6
Fe(NO ) — — 9
3 3
a
W/V means weight by volume.
2 © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Annex A
(informative)
Etchants for carbon steels and low-alloy steels
See Tables A.1 to A.13.
Table A.1 — Nital
Type of etchant: Macroscopic and microscopic etchant
Composition in volume and in order of mixing:
99 ml to 95 ml industrial methylated spirits*
1 ml to 5 ml nitric acid (HNO )
*Ethyl alcohol (C H OH), denatured with methyl alcohol (CH OH)
2 5 3
Also methyl alcohol or isoamyl alcohol [(CH ) CH(CH ) OH]
3 2 2 2
Safe shelf life: Indefinite
Surface preparation:
600 grit or finer (macroetching ≈ 5 % of nitric acid)
3 µm diamond or finer (microetching ≈ 2 % of nitric acid)
Etching temperature: Ambient
Etching time: A few seconds — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Can increase strength to 15 % for macroetching on ground surface — reveals ferrite boundaries —
differentiates ferrite from martensite. Good general purpose etchant.

Amyl alcohol is preferable for galvanized steel.

ISO/TR 16060:2003(E)
Table A.2 — Picral (4 %)
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml ethyl alcohol (C H OH)
2 5
4 g picric acid [C H OH(NO ) ]
6 2 2 3
[+ wetting agent (sodium dodecyl benzene sulphate) (C H NaSO ) if required]
18 29 4
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: Ambient
Etching time: A few seconds — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Little attack prior austenite boundaries — detects carbides — good resolution with fine pearlite,
martensite, tempered martensite and bainitic structures.

Table A.3 — Picric acid solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
1 l saturated aqueous picric acid [C H OH(NO ) ]
6 2 2 3
10 ml wetting agent (sodium dodecyl benzene sulphate) (C H NaSO )
18 29 4
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: 55 °C to 60 °C
Etching time: A few seconds — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Reveals prior grain boundaries and segregation.

4 © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Table A.4 — Picral (15 %)
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml ethyl alcohol* (C H OH)
2 5
15 g picric acid [C H OH(NO ) ]
6 2 2 3
*Also methyl alcohol (CH OH)
Safe shelf life: Indefinite
Surface preparation:
2 µm diamond or finer
Etching temperature: Ambient
Etching time: A few seconds to one minute — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Reveals general structure.
The composition given saturates the solution with picric acid.

Table A.5 — Hydrochloric picric acid solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml ethyl alcohol (C H OH)
2 5
1 ml hydrochloric acid (HCl)
4 g picric acid [C H OH(NO ) ]
6 2 2 3
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: Ambient
Etching time: 10 s to a few minutes
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Microstructural characterization of HAZ, weld and parent metal.
Especially effective for very fine structures. Less effective than Nital for the ferrite grain boundaries.

ISO/TR 16060:2003(E)
Table A.6 — Ammonium peroxodisulphate solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml water (H O)
10 g ammonium peroxodisulphate [(NH ) S O ]
4 2 2 8
Safe shelf life: Limited
Surface preparation:
6 µm diamond or finer
Etching temperature: Ambient
Etching time: 2 min to 3 min
Additional precautions/requirements: nil
Comments:
Reveals extent of HAZ.
Microscopic features of multipass welds.

Table A.7 — Alcoholic hydrochloric solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml ethyl alcohol (C H OH)
2 5
1 ml to 5 ml hydrochloric acid (HCl)
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: 40 °C to 50 °C
Etching time: A few seconds to one minute
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Add HCl to C H OH.
2 5
Comments: nil
6 © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Table A.8 — 120/10/30 etchant
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
120 ml ethyl alcohol (C H OH) or methyl alcohol (CH OH)
2 5 3
10 ml iron (III) chloride (FeCl ) (60 % W/V)
30 ml hydrochloric acid (HCl)
Safe shelf life: Indefinite
Surface preparation:
2 µm diamond or finer
Etching temperature: Ambient
Etching time: A few seconds by immersion —– check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Good general-purpose etchant.
Table A.9 — Cuprochloric solution 1
Type of etchant: Macroscopic etchant
Composition in volume and in order of mixing:
30 ml water (H O)
25 ml ethyl alcohol (C H OH)
2 5
40 ml hydrochloric acid (HCl)
5 g copper (II) chloride (CuCl )
Safe shelf life: 2 h
Surface preparation:
1 000 grit or finer
Etching temperature: Ambient
Etching time: 10 s to 20 s
Additional precautions/requirements:
After the etching, the specimen should be washed in order to remove copper deposits.
Usual precautions for handling and disposal of acids.
Comments:
Reveals cold working strain lines.

ISO/TR 16060:2003(E)
Table A.10 — Magneso cuprochloric solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml ethyl alcohol (C H OH)
2 5
20 ml water (H O)
1 ml hydrochloric acid (HCl)
4 g magnesium (II) chloride (MgCl )
1 g copper (II) chloride (CuCl )
Safe shelf life: 2 h
Surface preparation:
3 µm diamond or finer
Etching temperature: Ambient
Etching time: 60 s
Additional precautions/requirements:
Salts should be dissolved in the smallest amount of hot water, then diluted with ethyl alcohol.
A slight polishing (1 µm) after the etching furnishes the best contrast.
Comments:
Reveals phosphorus and related segregations. The copper deposits first of all on those areas
poorest in phosphorus.
Table A.11 — Adler’s etchant
Type of etchant: Macroscopic etchant
Composition in volume and in order of mixing:
25 ml water (H O)
.
3 g ammonium tetra chloro diaquo cuprate (II) [(NH ) CuCl 2H O]
4 2 4 2
50 ml hydrochloric acid (HCl)
15 g iron (III) chloride (FeCl )
Safe shelf life: Months
Surface preparation:
320 grit or finer
Etching temperature: Ambient
Etching time: 5 s to 10 s
Additional precautions/requirements:
.
Add [(NH ) CuCl 2H O] to H O (a).
4 2 4 2 2
Add FeCl to HCl (b).
Mix both then add (b) to (a).
Comments: nil
8 © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Table A.12 — Heyn’s etchant
Type of etchant: Macroscopic etchant
Composition in volume and in order of mixing:
120 ml water (H O)
.
10 g ammonium tetra chloro diaquo cuprate (II) [(NH ) CuCl 2H O]
4 2 4 2
Safe shelf life: Months
Surface preparation:
240 grit or finer
Etching temperature: Ambient
Etching time: 10 s to 1 min
Additional precautions/requirements:
.
Add [(NH ) CuCl 2H O] to H O.
4 2 4 2 2
Comments:
Copper deposit shall be removed.

Table A.13 — Ferric chloride solution
Type of etchant: Macroscopic etchant
Composition in volume and in order of mixing:
70 ml water (H O)
30 ml iron (III) chloride (FeCl ) (60 % W/V)
Safe shelf life: Indefinite.
Surface preparation:
1 000 grit or finer
Etching temperature: Ambient
Etching time: A few seconds
Additional precautions/requirements:
Usual precaution for handling and disposal of acids.
Comments:
1) Swab the surface;
2) Rinse with water;
3) Swab again the surface;
4) After etching, water rinse, alcohol rinse, dry.

ISO/TR 16060:2003(E)
Annex B
(informative)
Etchants for stainless steels
See Tables B.1 to B.12.
Table B.1 — Oxalic acid solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
100 ml water (H O)
10 g oxalic acid (ethanedioic acid) (C H O )
2 2 4
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: Ambient
Etching time: A few seconds — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Electrolytic 2 V to 6 V. Can reveal sensitivity to inter-crystalline corrosion.
Reveals general structure.
Reveals carbides at the grain boundaries.

Table B.2 — Thiocyanate solution
Type of etchant: Microscopic etchant
Composition in volume and in order of mixing:
80 ml water (H O)
20 ml sulphuric acid (H SO )
2 4
10 g ammonium thiocyanate (NH SCN)
Safe shelf life: Indefinite
Surface preparation:
3 µm diamond or finer
Etching temperature: Ambient
Etching time: A few seconds — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Electrolytic 1,5 V to 2,0 V.
Good general purpose etchant.
10 © ISO 2003 — All rights reserved

ISO/TR 16060:2003(E)
Table B.3 — Acidified ferric chloride solution
Type of etchant: Macroscopic etchant
Composition in volume and in order of mixing:
480 ml water (H O)
120 ml hydrochloric acid (HCl)
50 g iron (III) chloride (FeCl )
Safe shelf life: Indefinite
Surface preparation:
600 grit or finer
Etching temperature: Ambient
Etching time: A few seconds to one minute — check by eye
Additional precautions/requirements:
Usual precautions for handling and disposal of acids.
Comments:
Good general purpose macroscopic etchant, for austenitic chromium nickel and other stainless
steels.
Table B.4 — Modified Murakami's et
...